Geotechnical site investigation design, planning, supervision and management by direct techniques.: Shallow surveys: Hydraulic or mechanical grab samplers (Shipek, Van Veen, Box Corer); gravity samplers (basic gravity corer, piston corer, piston corer with Kullenberg device); vibrocorer samplers; seabed push-in samplers and shallow rotary drilling samplers (rock corer). Deep surveys in areas with water depths as shallow as 20 m: Rotary boreholes using conventional or wire-line drilling systems on light floating platforms, anchored barge, monopile platform, jack-up, etc. Deep surveys in areas with water depths more than 20 m: Rotary boreholes using conventional or wire-line drilling systems on vessels. Site testing: cone static penetration test (CPT) and piezocone (CPTU or PCPT) with different types of penetration systems (wheel-drive penetration test unit, light weight wheel-drive penetration test unit, Rov, minicone test, etc). Other test (autonomous or inside boreholes made): vane shear test (FVT), pressuremeter test, etc.
Logging, description, handling and labelling of samples and preparation of geotechnical site investigations reports.
Geotechnical site investigation design, planning, supervision and management by offshore geophysical survey techniques.: Bathymetry systems: echosounders, Swath echosounders and LIDAR. Seafloor morphology techniques: sub-bottom profilers (pinger), medium penetration profilers (boomer and CHIRP) and high penetration profilers (sparker). Geological survey systems: high resolution seismic refraction and electrical resistivity systems.
Soil or rock laboratory testing design, planning, supervisión and management.:
Soil. Classification tests: particle size distribution by sieving or by sedimentation; liquid and plastic limits (Atterberg limits); volumetric shrinkage limit, linear shrinkege; moisture content or water content; mass density (or unit weight); dry density (or dry unit weight); strength tests: unconfined compression test; direct shear box; triaxial compression; deformation tests: oedometer test; collapse and swelling tests: swelling and collapse on wetting test; compaction-related tests (standard or modified Proctor); pin-hole test; Pavement design tests: California bearing ratio (CBR); chemical tests: carbonate content, sulfate content, organic matter content, chloride content, pH; chemical analysis of ground water.
Rocks. Classification tests: moisture content, porosity, bulk density, water absorption. Strength tests: uniaxial compression, point load test or Franklin test, direct tensión test, indirect tensile strength test or Brazilian test, strength tests in discontinuities in direct shear box, triaxial compression; Deformation tests: determination of dynamic deformation modulus (Young modulus, poisson ratio). Durability tests: swelling, crumbling, moisture-dryness cycles, heating-cooling cycles; freeze-thaw cycles; salt crystallization cycles, immersion tests (Dusseault, Lutton), Slake-durability index test, speed of sound, primary or push-pull waves measurement in rock cores. Thin section petrographical analysis. X-ray difraction. Test for determining rock hardness and abrasiveness: Cerchar, sclerometer or Schmidt hammer, Schimazek abrasiveness index determination.
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